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"do hard reset:Press Right Soft Key and tap Reset at the same time,
then please first release reset and hold the Right Soft Key, After P320
is powered-on , clean boot prompt picture will show on
screen.Currently, you can release Right Soft Key. Follow the dialogue’s
message, you can press “SEND key” to start clean boot or press “END
key” to cancel clean boot.
You need to open up your phone and clean both the actual ear speaker and the two small pin holes on the cover with 91% or higher alcohol. If that doesn't solve the problem then need to replace your ear speaker.
View Voice Mail setup in you manual. Manuals are available online for read or download. Some VMail functions are Carrier specific. Look at info carrier included with your phone, or access your Vmail and you will hear an option for Vmail Setup. If these two steps don't work, call your carrier. This does sound like a carrier thing,
A caution regarding Hard Reseting your phone, this is a last resort to solving phone problems because a Hard Reset, as opposed to a Soft power off/on Reset, will default(set) your phone back to the state you received it from the mfg/carrier. ANYTHING you put/personalized on the phone is ERASED. This includes apps/settings/files/messages etc etc. Even if you have backedup your phone with a third party app, sometimes you will find your backup's won't work, or are a pain, to get your phone back to where it was when you did a Hard Reset. In addition, a Hard Reset is rarely your problem. It is usually a phone Setting, a phone Carrier,or defective phone(in which case it is worth trying a Hard Reset).
The problem is related to TomTom software. There are two methods to solve this problem. (1) You can choose to install TomTom 6.1 which has solved the sound problem if TomTom V6.1 is available for end user. (2) Find “BtCoreIf.dll”in Windows directory and rename it to "BtCoreIf.old”. Then, reset the device to solve the sound problem.
Do you usually use the handsfree ear piece? Try pluggin in the handsfree ear piece and see if you can hear something. The 6515 has a known issue with the system where by the phone thinks its in handsfree ear piece mode when there isnt a ear piece plugin. Try pluging and unpluggin the ear piece until it works